NO.PZ202001110100002801
问题如下:
a. What conditions must k and m satisfy for the first difference series to be stable?
选项:
解释:
Given that the equation has a unit root means that the factorization of the characteristic equation must be of the form:
,
where 0 < | c| < 1
The characteristic equation for the original relationship is
Therefore, it is required that |m| < 1 and
k = (-m + 1) or (1 - m)
请问一下这个是哪个知识点呀?谢谢老师